I need a few tips from you on Analog design in general: I have seen that a lot of ADCs have a separate AGND and DGND, but they are shorted at the chip. I believe this is required to keep the noisy digital return paths sperate from the analog return paths.
However if both get shorted at the ADC what purpose will it serve? Do you know any good application notes which clarify this ?
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Some ADCs have differential inputs which are some times not used. Strain gauge bridge amplifiers may need differential measurement. When common mode measurements are made one end can be grounded.
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